<template>
  <div>
    <div class="todo-container">
      <div class="todo-wrap">
        <MyHeader :addTodo="addTodo"></MyHeader>
        <MyList
          :todos="todos"
          :checkTodo="checkTodo"
          :deleteTodo="deleteTodo"
        ></MyList>
        <MyFooter
          :todos="todos"
          :checkAllTodo="checkAllTodo"
          :clearAllTodo="clearAllTodo"
        ></MyFooter>
      </div>
    </div>
  </div>
</template>

<script>
import MyList from "./components/MyList.vue";
import MyFooter from "./components/MyFooter.vue";
import MyHeader from "./components/MyHeader.vue";

export default {
  name: "App",
  components: {
    MyList,
    MyFooter,
    MyHeader,
  },
  data() {
    return {
      //如果有todos，就直接读取，没有就读空数组。避免用户第一次使用浏览器本地没有todos的情况
      todos: JSON.parse(localStorage.getItem("todos")) || [],
    };
  },
  methods: {
    //添加一个todo
    addTodo(todoObj) {
      //注意这里的名字不要和要传进去的组件里的方法名重复
      this.todos.unshift(todoObj);
    },

    // 勾选or取消勾选一个todo
    checkTodo(id) {
      this.todos.forEach((todo) => {
        if (todo.id == id) todo.done = !todo.done;
      });
    },

    // 删除
    deleteTodo(id) {
      this.todos = this.todos.filter((todo) => {
        return todo.id != id;
      });
    },

    //全选
    checkAllTodo(done) {
      this.todos.forEach((todo) => {
        todo.done = done;
      });
    },

    //清除所有done值为真的数据

    clearAllTodo() {
      this.todos = this.todos.filter((todo) => {
        return todo.done == false;
      });
    },
  },
  watch: {
    // todos(newVal) {
    //   localStorage.setItem("todos", JSON.stringify(newVal));
    // },
    todos: {
      immediate: true,
      deep: true,
      handler(newVal) {
        localStorage.setItem("todos", JSON.stringify(newVal));
      },
    },
  },
};
</script>

<style>
/*base*/
body {
  background: #fff;
}

.btn {
  display: inline-block;
  padding: 4px 12px;
  margin-bottom: 0;
  font-size: 14px;
  line-height: 20px;
  text-align: center;
  vertical-align: middle;
  cursor: pointer;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2),
    0 1px 2px rgba(0, 0, 0, 0.05);
  border-radius: 4px;
}

.btn-danger {
  color: #fff;
  background-color: #da4f49;
  border: 1px solid #bd362f;
}

.btn-danger:hover {
  color: #fff;
  background-color: #bd362f;
}

.btn:focus {
  outline: none;
}

.todo-container {
  width: 600px;
  margin: 0 auto;
}
.todo-container .todo-wrap {
  padding: 10px;
  border: 1px solid #ddd;
  border-radius: 5px;
}
</style>
